Sears 917.25051 Engine, To Adjust Throttle Control Cable See Figs, To Adjust Carburetor See Fig=

RViCE ADJUSTMENTS

ENGINE

TO ADJUST THROTTLE CONTROL CABLE (See Figs. 34 and 35)

The throttle control has been preset at the factory and adjustment should not be necessary, Check adjustment as described below before loosening cable. If adjustment is necessary, proceed as follows:

=With engine not running, move throttle control lever to fast (,f_) position.

,Check that speed control lever is against stop screw. If it is not, loosen casing clamp screw and pull throttle cable until lever is against screw. Tighten clamp screw securely.

TO ADJUST CARBURETOR (See Fig= 36)

The carburetor has been preset at the factory and adjust- ment should not be necessary, However, minor adjustment may be required to compensate for differences in fuel, temperature, altitude or load. If the carburetor does need adjustment, proceed as follows:

In general, turning the adjusting needles in (clockwise) decreases the supply of fuel to the engine giving a leaner fuel/air mixture. Turning the adjusting needles out (coun- terclockwise) increases the supply of fuel to the engine giving a richer fuel/air mixture.

IMPORTANT: DAMAGE TO THE NEEDLES AND THE

SEATS IN CARBURETOR MAY RESULT IF SCREW IS TURNED IN TOO TIGHT.

PRELIMINARY SETTING -

•Be sure you have a clean air filter, and the throttle control cable is adjusted properly (see above).

•With engine off turn idle fuel adjusting needle in (clock- wise) closing it finger tight and then turn out (counter- clockwise) 1-1/4 turns.

=Turn main fuel adjusting needle in (clockwise) closing finger tight and thentum out (counterclockwise) 1 turn.

FINAL SETTING -

,,Start engine and allow to warm for five minutes, Make

final adjustments with engine running and shift/motion control lever in neutral (N) position.

.	With	throttle control lever in fast ( .1_ ) position, turn
	main fuel adjusting needle in (clockwise) until engine
	beg!ns to die then turn out (counterclockwise) until
	engine runs rough. Turn needle to a point midway
	between those		two	positions.
.	!.d!e speed setting			- With	throttle	control	lever	in slow
	(,_)	position,	engine		should	idle at	1400	RPM. if
	engine idles too slow or fast, turn idle speed adjusting
	screw in or out until correct idle is attained.

,,Ide fuel needle setting - With throttle control lever in slow (._b) position, turn idle fuel adjusting needle in (clockwise) until engine begins to die and then turn out (counterclockwise) until engine runs rough. Turn needle to a point midway between those two positions.

•Recheck idle speed, Readjust if necessary.

ACCELERATION TEST

•Move throttle control lever from stow (,_) to fast (,_) position, tf engine hesitates or dies, turn idle mixture

screw out (counterclockwise) 1/8 turn. Repeat test and

continue to adjust, if necessary, until engine acceler- ates smoothly.

High speed stop is factory adjusted. Do not adjust-damage may result.

IMPORTANT: NEVER TAMPER WITH THE ENGINE

GOVERNOR, WHICH IS FACTORY SET FOR PROPER

ENGINESPEED. OVERSPEEDINGTHEENGINEABOVE

THE FACTORY HIGH SPEED SETTING CAN BE

DANGEROUS. IF YOU THtNKTHE ENGINE-GOVERNED

HIGH SPEED NEEDS ADJUSTING, CONTACT YOUR

NEAREST AUTHORIZED SERVICE CENTER/

DEPARTMENT, WHICH HAS PROPER EQUIPMENT AND

EXPERIENCE TO MAKE ANY NECESSARY ADJUSTMENTS.

CASING	STOP SCREW	SPEED CONTROL
CLAMP		LEVER

THROTTLE

CONTROL

CABLE

FiG. 34

STOP

SCREW

SPEED

CONTROL

LEVER

FIG. 35

IDLE SPEED	IDLE FUEL
ADJUSTING	NEEDLE
SCREW

UEL

ADJUSTING

NEEDLE

FiG. 36

26